K. Fertas, H. Kimouche, M. Challal, H. Aksas, R. Aksas and A. Azrar, “ Design and Optimization of a CPW-Fed Tri-band Patch Antenna using Genetic Algorithms, ” ACES Journal- Applied Computational Electromagnetics Society Journal , vol. 30, n° 7, pp. 754-759, Jul. 2015. Website: http://www.acessociety.org/search.php?vol=30&no=7&type=2, Publisher : Applied Computational Electromagnetics Society.

B. Semmar, R. Aksas, M. Challal, A. Azrar, and M. Trabelsi, “Numerical Determination of Permittivity and Permeability Tensors of a Dielectric Metamaterial Composed of an Infinite Number of Split Ring Resonators , ” International Journal of Wireless Personal Communications, vol. 83, No. 4, pp. 2925-2947, Aug. 2015. DOI: 10.1007/s11277-015-2574-0, Publisher: Springer.

M. Challal, M. Dehmas, A. Azrar , R. Aksas and M. Trabelsi, “Novel Design of Miniaturized Broad Stopband Bandpass Filter using Defected Ground Structure, ” IJMOT-International Journal of Microwave and Optical Technology, vol. 9, No. 6, pp. 415-420, Nov. 2014. Website: http://www.ijmot.com/VOL9NO6.ASPX, Publisher: Electrical Engineering Department, University of Nevada

M. Challal, A. Boutejdar, A. Azrar and D. Vanhoenacker-Janvier, “Design of Compact Low Pass Filter with Large Reject Band Using Open Circuit Stubs and Two Cascaded DGS-Quasi-Triangular Resonators, ” MOTL - Microwave and Optical Technology Letters, vol. 55, issue 1, pp.122-127, January 2013. DOI: 10.1002/mop.27260, Publisher: John Wiley & Sons

M. Challal, A. Boutejdar, M. Dehmas, A. Azrar and A. Omar “Compact Microstrip Low-Pass Filter Design with Ultra-Wide Reject Band using a Novel Quarter-Circle DGS Shape, ” ACES Journal- The Applied Computational Electromagnetics Society, vol. 27, n° 10, pp. 808-815, Oct. 2012. Website: http://www.aces-society.org/search.php?q=++challal&search=Search, Publisher: Applied Computational Electromagnetics Society